It is not a standard size as it is not an original fitting. There were originally circular cork inserts for a few years, and then changed to Ferodo type inserts of the same size. Here in the UK we can send our clutch chainwheels to Saftek in Cleckheaton to have the inserts replaced with a ring of friction material at a VERY reasonable price, and a fast service of two or three working days, but I have no idea if there is a firm in Oz doing it….
Brian
